入口位置对多入口旋风分离器性能的影响

Effect of inlet position on the performance of a multi-inlet gas cyclone

对称多入口结构有助于提高旋风分离器的性能,但入口位置的选择尚无明确的规范。在Lapple型旋风分离器的基础上,设计了4种不同入口位置的四入口旋风分离器,并采用数值模拟方法研究了入口位置对于其流场和分离性能的影响。结果表明:当入口在径向外侧时,切向速度能够保持稳定,短路流量占比较低,此时压降较低,分离效率较高;而当入口在径向内侧时,切向速度会降低,短路流量占比增大,此时压降降低,分离效率也大幅下降。入口在轴向方向的位置对于流场和性能的影响并不明显,而径向外侧、轴向上方的入口设计为最优方案。

Symmetrical multi-inlet structure can improve the performance of gas cyclone,but there is no clear specification for the choice of inlet location.Based on the Lapple cyclone,four quadruple-inlet cyclones with different inlet positions were designed in this study.The influence of the inlet position on its flow field and separation performance of the cyclones was studied using numerical simulation methods.Results show that when the inlet is radially outward,the tangential velocity can be kept stable,the short-circuiting flow rate is small,the pressure drop is low,and the separation efficiency is high.When the inlet is radially inward,the tangential velocity decreases,the short-circuiting flow rate increases,the pressure drop decreases,and the separation efficiency also decreases significantly.The effect of the position of the inlet in the axial direction on the flow field and separation performance is not significant.The inlet that is radially outward and axially upward is found to be the optimal design.